PubMed · 3344374
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C Moreau. 1988. [Biological rhythms].. https://pubmed.ncbi.nlm.nih.gov/3344374/
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Mast seeding, or masting, is the variable production of flowers, seeds, or fruit across years more or less synchronously by individuals within a population. A critical issue is the extent to which temporal variation in seed production over a collection of individuals can be viewed as arising from a combination of individual variation and synchrony among individuals. Studies of masting typically quantify such variation in terms of the coefficient of variation (CV). In this paper we examine mathematically how the population CV relates to the mean individual CV and synchrony, concluding that the relationship is a complex one which cannot isolate an overall measure of synchrony, and involves additional factors, principally the number of plants sampled and the mean productivity per plant. Our development suggests some simple approximate relationships of population CV to individual variability, synchrony and the number of individuals. These were found to fit quite well when applied to data from 59 studies which included seed production at the individual level.
STUDY OBJECTIVES: Sleep and circadian rhythms are biologic processes operative in health and disease, but as yet there is no articulated curriculum for undergraduate medical education. DESIGN: A multidisciplinary expert-opinion approach was utilized to assess and define education objectives and the potential for implementation. SETTING: N/A. PATIENTS OR PARTICIPANTS: National Institutes of Health Sleep Academic Awardees. INTERVENTIONS: N/A. RESULTS: Four competencies with examples of instruction objectives were identified relating to sleep processes and sleep need, the impact of sleep and sleep disorders on human illness, the sleep history, and the application of sleep physiology and pathophysiology to patent care. Various strategies and tools are currently available for implementation and assessment of learning objectives for these knowledge and skills. CONCLUSION: The core competencies can be designed to improve physician knowledge and skills in recognizing and intervening in sleep problems and disorders. Learning objectives can be immediately incorporated into most medical school curricula. At the same time, these competencies serve as an important bridge across multiple medical content areas and disciplines and between undergraduate and postgraduate training.
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